Manufactured from hardened and tempered drop-forged Chrome Vanadium steel. Push-button quick adjustment/release. Serrated jaws, induction-hardened 55-65 HRC. Dual material comfort grip handles and black oxide finish for corrosion resistance. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. Manufactured from hardened and tempered drop-forged Chrome Vanadium steel. Push-button quick adjustment/release. Serrated jaws, induction-hardened 55-65 HRC. Dual material comfort grip handles and black oxide finish for corrosion resistance. Lifetime guarantee*.